beetbox/beets ? reverse-engineered prompt

Build me a Python music library manager called beets that helps clean up and organize a messy music collection from the command line. I want it to scan folders of songs, match albums and tracks against MusicBrainz, fix file names and tags, and show a clear import flow so I can see what got changed before it writes anything. It should also support a few practical extras like finding duplicates, spotting missing tracks, pulling album art, and transcoding songs to another format when needed. If it makes sense, add a simple web browser view for browsing my library and playing music in the browser, and leave it easy to extend with plugins for things like lyrics, genres, ReplayGain, or other metadata. Keep the app practical and polished, with good defaults, helpful error messages, and a clean README explaining how to install and use it. Look up current docs online if you need to.